<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>2048游戏界面</title>
    <style>
        body { background: url("./images/bg3.jpg") repeat; }
        #canvas { border: 1px solid #aaaaaa; display: block; margin: 50px auto; }
    </style>
</head>
<body>
<div id="canvas-warp">
    <canvas id="canvas">
        你的浏览器居然不支持Canvas？！赶快换一个吧！！
    </canvas>

</div>

<script>
    window.onload = function(){
        var canvas = document.getElementById("canvas");
        canvas.width = 800;
        canvas.height = 600;
        var context = canvas.getContext("2d");
        context.fillStyle = "#FFF";
        context.fillRect(0,0,800,600);

        drawRoundRect(context, 200, 100, 400, 400, 5);
        context.fillStyle = "#AA7B41";
        context.strokeStyle = "#0078AA";
        context.stroke();
        context.fill();

        for(var i = 1; i <= 4; i++){
            for(var j = 1; j <= 4; j++){
                drawRoundRect(context, 200 + 16 * i + 80 * (i - 1), 100 + 16 * j + 80 * (j - 1), 80, 80, 5);
                context.fillStyle = "#CCBFB4";
                context.strokeStyle = "#0078AA";
                context.stroke();
                context.fill();
            }
        }
    };

    function drawRoundRect(cxt, x, y, width, height, radius){
        cxt.beginPath();
        cxt.arc(x + radius, y + radius, radius, Math.PI, Math.PI * 3 / 2);
        cxt.lineTo(width - radius + x, y);
        cxt.arc(width - radius + x, radius + y, radius, Math.PI * 3 / 2, Math.PI * 2);
        cxt.lineTo(width + x, height + y - radius);
        cxt.arc(width - radius + x, height - radius + y, radius, 0, Math.PI * 1 / 2);
        cxt.lineTo(radius + x, height +y);
        cxt.arc(radius + x, height - radius + y, radius, Math.PI * 1 / 2, Math.PI);
        cxt.closePath();
    }
</script>
</body>
</html>